Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf36a3420fd8b81…

MALICIOUS

PDF

39.4 KB Created: 2020-09-02 22:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b04385fa36883c4e32abade9ca5b4f4 SHA-1: 8a59a0c565f8d512cc1cfa3dc802ce0ad212c0c6 SHA-256: ecf36a3420fd8b81c5836979b8481907c07e1b1e834ee42f8fa31bf0a7b43314
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body, though heavily obfuscated, contains the URL that triggered this alert. The presence of numerous other links, many pointing to static.usrfiles.com, suggests a link farm designed to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=restaurant+manager+checklist+template
    • https://static.usrfiles.com/ugd/191a6d_1d04e06030ce42c7b4c1251aabd3beca.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_17d3c15a09e94cc2b384117198497f31.pdf
    • https://static.usrfiles.com/ugd/19103d_d3ac5be8788c47e5980f3f5d9757278d.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3443/files/free_online_android_editor.pdf
    • https://cdn.shopify.com/s/files/1/0435/9412/1379/files/53008832786.pdf
    • https://static.usrfiles.com/ugd/b8c837_d60ebab9554d4247b20a0034793baf23.pdf
    • https://static.usrfiles.com/ugd/44b221_1946c49f58854071891b239b553103cd.pdf
    • https://static.usrfiles.com/ugd/0c268c_52130d9db9c140daae66aa0900085ac3.pdf
    • https://static.usrfiles.com/ugd/599026_445e9e0871074b829ec423ba05daf554.pdf
    • https://static.usrfiles.com/ugd/11b39a_bdc149d736304c8a9ba7aae511b13559.pdf
    • https://static.usrfiles.com/ugd/a07927_530cff2ce2584bbca3d57ea0b7d31ee4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cf2.bin
85cf9a05fc8c224c5fc241ecccf4a0d53c547c9a19dffd8586cdfb9a2006a951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF2 5420 bytes
font_01_sfnt_off00006f3a.bin
a2fc0102667e36f3d3b57d7f78704c4b32c025166304cf0603c768450d893a1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 9892 bytes

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